Compact Type 2+3 AC Surge Protection for 1P+N Systems
LY1-D20M/1(S)+1 is a compact 1P+N pluggable Type 2+3 AC surge protective device for single-phase plus neutral systems. Its coordinated MOV and GDT structure provides L-N and N-PE protection with 10kA nominal discharge current and 20kA maximum discharge current, while the mini-size housing helps save DIN-rail space.
Class II+III / Type 2+3 downstream surge protection
Compact 1P+N configuration with L-N and N-PE protection
Coordinated high-energy MOV and GDT protection technology
Pluggable modules with visual status indication and optional remote contact
Suitable Applications
LY1-D20M/1(S)+1 is suitable for compact single-phase plus neutral systems requiring coordinated Type 2+3 surge protection in limited DIN-rail space.
Residential Panels
For compact residential distribution boards and single-phase household consumer units.
Compact Control Panels
Suitable for small machinery controls, automation cabinets, HVAC panels, and compact equipment boxes.
UPS & Telecom Power
Helps protect UPS inputs, telecom power supplies, communication equipment, and sensitive electronic loads.
Solar Inverter AC Boxes
For single-phase solar inverter AC-side boxes when the selected Uc rating matches the system voltage.
FAQ
Common questions about LY1-D20M/1(S)+1 compact 1P+N pluggable Type 2+3 AC surge protective device selection.
What is LY1-D20M/1(S)+1 used for?
LY1-D20M/1(S)+1 is used for downstream and final-distribution surge protection in compact single-phase plus neutral AC systems. It helps limit transient overvoltage through coordinated L-N and N-PE protection paths.
Is LY1-D20M/1(S)+1 a multi-pole three-phase SPD?
No. LY1-D20M/1(S)+1 is a compact 1P+N SPD for single-phase plus neutral systems. The previous description referring to a three-phase multi-pole system should not be used.
Is this a Type 2 or Type 3 SPD?
LY1-D20M/1(S)+1 is classified as Class II+III / Type 2+3, making it suitable for coordinated downstream and final-distribution surge protection.
What protection technology does it use?
It combines a high-energy MOV on the L-N path with a gas discharge tube on the N-PE path, providing coordinated protection for single-phase plus neutral systems.
What discharge current ratings does it provide?
It provides 10kA nominal discharge current and 20kA maximum discharge current on both the L-N and N-PE protection paths.
What should be confirmed before ordering?
Confirm the nominal L-N voltage, required Uc and Up level, 1P+N wiring arrangement, 125A maximum backup-fuse coordination, DIN-rail space, conductor size, and optional remote-contact requirement.
